Delete row ('635', '20480') from daily_volatility

ticker_id 635
day 20480
implied_open 0.8572234247849274
implied_high 0.8603983263582049
implied_low 0.8016626472525711
implied_close 0.8334116629853461
historical_open 0.7794383362396284
historical_high 0.7794383362396284
historical_low 0.7794383362396284
historical_close 0.7794383362396284
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